Deductions & credits

I opened Turbotax 2019.  Under easy step, I did not select Safe Harbor.  There is a note at the bottom that says "you may still qualify for a QBI deduction".  Sure enough, a QBI deduction was calculated even though I did not select Safe Harbor.  On TurboTax 2020, if I don't select Safe Harbor, the deduction is not calculated.  It is hard to understand that from year to year the results are different.